- Name: Takagi Sayuki (高木紗友希)
- Nickname: Sayubee (さゆべえ)
- Birthday: April 21, 1997
- Birthplace: Chiba, Japan
- Blood type: A
- Height: 154cm
- Specialty: Self-learning kung-fu
- Hobby: Singing
- Looks Up To: Tanaka Reina, Berryz Kobo
- Hello! Project groups:
- [2015.12.xx] Greeting ~Takagi Sayuki~ (Greeting~高木紗友希~)
- [2014.02.27] Juice=Juice 1st OFFICIAL PHOTO BOOK (Miyazaki Yuka, Kanazawa Tomoko, Takagi Sayuki, Miyamoto Karin, Uemura Akari)
-  Gekijouban Hontoni Atta Kowai Hanashi 3D (劇場版ほんとうにあった怖い話3D)
- TV Dramas
- TV Programs
-  Asonde Manabu (アソンデマナブ)
-  Tokidoki Mayomayo (時々迷々) (Mini-drama "Uso・Uso・Uso" (ウソ・ウソ・ウソ))
-  Hello! SATOYAMA Life (ハロー！ＳＡＴＯＹＡＭＡライフ)
- [2014–] The Girls Live
-  Hello Pro Kenshuusei no Tadaima Kenshuuchuu! (ハロプロ研修生のただ今研修中!)
- [2013–] Hello! Station (ハロ！ステ)
-  Coco Smile 6 (ココ・スマイル6)
-  Ima ga Itsuka ni Naru Maeni (今がいつかになる前に)
-  Reborn~Inochi no Audition~ (リボーン～命のオーディション～) (as Kounotori)
-  Musical Koisuru Hello Kitty (ミュージカル恋するハローキティ)
- Her Juice=Juice image color and flavor is lemon.
- She was first introduced at the 2009 Hello! Project Shinjin Kouen 11gatsu ~Yokohama FIRE!~ concert on November 23, 2009.
- She has an older sister and a younger sister.
- She participated in the 2011 S/mileage auditions, but failed.
- She is a back dancer for Mano Erina.
- She has given valentines chocolate to Tanaka Reina.
- On a rainy day she would watch Hello! Project live DVDs.
- She would sing the song "Umbrella" by Tanpopo# on a rainy day.
- She participated in the Morning Musume 11th Generation ~Suppin Utahime~ Audition, but failed.
- Her best sport is swimming.
- She covered "Wakuteka Take a Chance" as Ikuta Erina in Team Okai.
- Likes the song "Masshiroi Ano Kumo" by Berryz Kobo.
- Auditioned for Hello! Pro Kenshuusei because she had confidence in her singing and wanted to see how far it could take her.
- Likes and respects the group Kobukuro.
- Said her favorite Hello! Project song is "Shabondama" by Morning Musume.
- She enjoys taking walks.